NEET Botany — MCQ Practice Questions & Answers

Question 1

In a monohybrid cross between two heterozygous plants (Aa × Aa), what is the phenotypic ratio in the F2 generation?

Accepted Answer

Correct answer: B. 3:1 — For a monohybrid cross Aa × Aa, the F2 generation shows 3 dominant : 1 recessive phenotypic ratio, following Mendel's law of segregation.

Answer

A. 1:1

Answer

C. 9:3:3:1

Answer

D. 1:2:1

Question 2

What is the chromosome number in a human somatic cell?

Accepted Answer

Correct answer: B. 46 — Human somatic cells are diploid with 46 chromosomes (23 pairs). Gametes contain 23 chromosomes (haploid).

Answer

A. 23

Answer

C. 92

Answer

D. 48

Question 3

Which law states that factors (alleles) segregate during gamete formation?

Accepted Answer

Correct answer: B. Law of Segregation — Mendel's Law of Segregation describes how alleles separate during meiosis, resulting in each gamete receiving only one allele for each gene.

Answer

A. Law of Dominance

Answer

C. Law of Independent Assortment

Answer

D. Law of Linkage

Question 4

A test cross involves crossing an organism with a dominant phenotype with a _______ individual.

Accepted Answer

Correct answer: C. Homozygous recessive — A test cross pairs an individual showing the dominant phenotype with a homozygous recessive individual to determine the genotype of the dominant phenotype.

Answer

A. Homozygous dominant

Answer

B. Heterozygous

Answer

D. Any individual

NEET Botany - MCQ Practice Questions